My cat's lip is swollen after Clavamox. Is it an allergic reaction?

It would be unusual for allergies to only affect one side (although cats are prone to 'eosinophilic plaques from hypersensitivities) and the cobblestone appearance of the inside of the lip is a little concerning. I recommend a full physical exam by your vet - they may wish to sedate him to take samples of the area to rule out sinister causes and to guide the most appropriate treatment

The swelling could be caused by blunt trauma (for example if she run into something) or allergic reaction. If it is not bothering Kitty at all, is not itchy or painful when you touch it, I would leave it for another 2-3 days. Most of the mild swelling regardless on the cause should disappear within 5-7 days. If the swelling becomes itchy, painful or gets bigger, please take Kitty to your local vets for a check up.

Hello and thank you for taking such good care of Rosie. I really appreciate you taking the time to submit pictures of her lips and mouth. Cats can sometimes get the same kinds of mouth and lip diseases that people get. Perhaps she bumped it against something or scraped it on rough surface as she was being curious. Another reason for swollen lips are possible allergic reactions to insect bites or noxious substances. In addition, dental disease or improper teeth occlusion can can cause lip abrasions. My best advice is this: As long as she is eating, drinking, and playing normally, give the lip 3 days to improve and get smaller. If there is no improvement in that time, or if the lip gets bigger in the meantime, please have her seen by your veterinarian for a thorough oral examination. I hope this helps. Thanks for your question.

From the photos it looks like Xena has a "rodent ulcer" (aka: eosinophilic granuloma complex). It is best to have her checked out by your regular veterinarian to get a definitive diagnosis and treatment. ( https://veterinarypartner.vin.com/default.aspx?pid=19239&id=4951528 ) Hope this helps. Best wishes.

This does not look like an allergic reaction which could come from a systemic medication. This lump/growth should be ideally examined by your veterinarian to have a definitive diagnosis. Your vet will examine it and possibly perform with an FNA (fine needle aspiration) or a biopsy. Differentials would include skin cyst, an insect bite, the result of a trauma, infections or benign or malignant type of tumors (very unlikely given the age). Hope this answer was helpful, but please do not hesitate to contact us again on the forum or by requesting a consultation if you have any more questions or to discuss it any further. If this answer was helpful please let us know, this will be used to improve our service!

This could be the beginning of a condition also known as "rodent ulcer", it's basically an autoimmune reaction and it is not surprising if it starts to occur around pregnancy time. at the moment as long as it doesn't bother her and it doesn't become much larger, i would recommend just monitoring it, as treatment for this condition usually involve steroids which you can't give to a lactating mother.

This is a common look for cats who are allergic to their food bowls -- if any of his bowls are plastic, I'd recommend switching them out for glass and washing daily (or at least every other day). It could be caused by other allergies or a bug bite as well, and often goes away on it's own. If switching bowls (if applicable) and giving it a week doesn't make it go away, I'd recommend a vet visit.